E46 - 323i ; 328i ;
E39 - 523i 528i
Z3 - Z3 2.5 2.8 M52TU double vanos
This adapter plate is manufactured for M54 manifold conversion to put M52 double vanos throttle body on M54B30 (from 3.0 ltr double vanos 330i, 530i, X3 3.0i, X5 3.0i) intake manifold. Comes with fitting hardware. This plate will not restrict air flow due to special design.
M54 manifold conversion for these engines will give 10-15 bhp more power and a very strong top end as it lets the engine breathe much better.